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Presented at the NABS Annual meeting, Pittsburgh, Pennsylvania, 2002
in Lentic Ecology
DISTRIBUTION OF BENTHIC MACROINVERTEBRATES IN A SOUTHEASTERN RESERVOIR (KENTUCKY LAKE, KENTUCKY) BASED ON SPATIAL, TEMPORAL AND PHYSICAL-CHEMICAL CHARACTERISTICS.
D. Moyer, D. White, and G. Kipphut. Hancock Biological Station and Center for Reservoir Research, Murray State University, 561 Emma Drive, Murray, Kentucky 42071
The macroinvertebrate community structure and physical-chemical properties were examined from various subsurface contours along a cross-section of Kentucky Lake reservoir on the Tennessee River system. The five dominant species were Coelotanypus (PP), Limnodrilus (CG), Chaoborus (PP), Chironomus (CG) and Sphaeriinae (FF). The dominant FFG's were PP and CG. Annual abundances of major taxonomic groups showed that Chironomidae represented (45.4%), total combined other taxa (32.3%) and Oligochaeta (22.3%) of total organisms. Macroinvertebrate temporal dynamics suggested increased total organism abundance, richness and diversity in winter months. CCA demonstrated some niche separation among depositional communities. Complementary use of cluster analysis also showed similar benthic groupings. Sites appeared to spread out more along CCA axis 2 (influenced more by %C, Fe, depth and porosity) than along axis 1 (influenced by 13C and C/N ratios), especially embayment sites. An erosional site was the most different as a result of increased 13C and decreased C/N ratios. Distinct FFG's were observed for some clusters and sites such as SC at an erosional site, FF at floodplain and main channel sites, and PP at embayment sites. Complementary use of canonical correlation analysis also indicated that sites with high PP had high Fe and low %C.
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